SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7c34ac74b665a76688a055454e374c98d48e22e07c67d10fdac8d093ea8f1515' 
  AND token = 'DSjB8hYzkpQVo84rtFPYv4b0guCJ6lRzWFnSBGUK+mE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}